.page-about {
  --about-rail-w: 96px;
  --about-tick: 9px;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: clamp(16px, 3vw, 28px);
}
.page-about .about-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}
.page-about .about-crumbs__item + .about-crumbs__item::before {
  content: "/";
  margin: 0 8px;
  color: var(--mist);
}
.page-about .about-crumbs__item a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .about-crumbs__item a:hover,
.page-about .about-crumbs__item a:focus-visible {
  border-bottom-color: var(--lake);
}

/* 档案封面 */
.page-about .about-cover {
  padding-block: clamp(22px, 4vw, 40px) clamp(32px, 6vw, 64px);
}
.page-about .about-cover__head {
  max-width: 52em;
}
.page-about .about-cover h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 64px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.page-about .about-cover .lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-cover__grid {
  margin-top: clamp(24px, 4vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}
@media (min-width: 820px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

/* 关键档案标签 */
.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
@media (min-width: 520px) {
  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 16px 16px;
  background: var(--archive);
  border: var(--line);
  border-radius: var(--radius);
  position: relative;
}
.page-about .about-facts__item::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 22px;
  height: 22px;
  background: var(--paper);
  border-left: var(--line);
  border-bottom: var(--line);
}
.page-about .about-facts__num {
  align-self: flex-start;
  display: inline-block;
  padding: 3px 9px 5px;
  background: var(--flag-yellow);
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .about-facts__label {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink);
}

/* 封面图 */
.page-about .about-cover__figure .figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}
.page-about .about-cover__figure .figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 双栏正文：左刻度 + 右段落 */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-block: clamp(28px, 5vw, 56px);
  border-top: var(--line);
}
@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 64px);
  }
}

.page-about .about-rail {
  display: none;
}
@media (min-width: 900px) {
  .page-about .about-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: 24px;
  }
}
.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--archive);
  display: flex;
  flex-direction: column;
  gap: 26px;
}
.page-about .about-rail__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 3px;
  width: var(--about-tick);
  height: var(--about-tick);
  box-sizing: border-box;
  background: var(--paper);
  border: 1px solid var(--mist);
}
.page-about .about-rail__item.is-active {
  color: var(--lake);
}
.page-about .about-rail__item.is-active::before {
  background: var(--lake);
  border-color: var(--lake);
}
.page-about .about-rail__year {
  font-size: 13px;
  font-weight: 700;
  color: inherit;
}

.page-about .about-main {
  display: flex;
  flex-direction: column;
  gap: clamp(32px, 5vw, 54px);
  max-width: 44em;
}
.page-about .about-block__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lake);
}
.page-about .about-block h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .about-block p {
  margin: 0 0 14px;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-block p:last-child {
  margin-bottom: 0;
}
.page-about .about-block__tail {
  margin-top: 18px;
  padding: 12px 14px;
  border-left: 4px solid var(--lake);
  background: var(--archive);
  font-size: 15px !important;
  line-height: 1.75;
}
.page-about .about-block a {
  color: var(--lake);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .about-block a:hover,
.page-about .about-block a:focus-visible {
  color: var(--deep);
}

/* 三组分工 */
.page-about .about-groups {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
@media (min-width: 720px) {
  .page-about .about-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-groups__item {
  padding: 15px 15px 16px;
  background: var(--cloud);
  border: var(--line);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius);
}
.page-about .about-groups__name {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-groups__dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  background: var(--lake);
}
.page-about .about-groups__item:nth-child(2) .about-groups__dot {
  background: var(--ochre);
}
.page-about .about-groups__item:nth-child(3) .about-groups__dot {
  background: var(--flag-green);
}
.page-about .about-groups__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

/* 三级校验步骤 */
.page-about .about-steps {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-top: 14px;
  border-top: 1px solid var(--archive);
}
.page-about .about-steps__item:first-child {
  padding-top: 0;
  border-top: none;
}
.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--ochre);
}
.page-about .about-steps__body h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-steps__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* 时间轴 */
.page-about .about-miles {
  position: relative;
  margin-block: clamp(30px, 5vw, 56px);
  padding-block: clamp(34px, 5vw, 60px);
  background: var(--archive);
  border-top: var(--line);
  border-bottom: var(--line);
  overflow: hidden;
}
.page-about .about-miles__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.22;
  pointer-events: none;
}
.page-about .about-miles__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about .about-miles__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-miles__inner h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .about-miles__intro {
  margin: 12px 0 0;
  max-width: 40em;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .about-miles__list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
@media (min-width: 780px) {
  .page-about .about-miles__list {
    grid-template-columns: 0.8fr 1.15fr 1fr 0.9fr;
    align-items: start;
    gap: 16px;
  }
}
.page-about .about-miles__node {
  position: relative;
  background: var(--paper);
  border: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .about-miles__node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 14px;
  width: 8px;
  height: 8px;
  background: var(--ochre);
  z-index: 2;
}
.page-about .about-miles__summary {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 34px 14px 14px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-miles__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-miles__summary::after {
  content: "+";
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--ochre);
}
.page-about .about-miles__node[open] .about-miles__summary::after {
  content: "−";
}
.page-about .about-miles__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lake);
}
.page-about .about-miles__label {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-miles__text {
  margin: 0;
  padding: 0 14px 16px;
  border-top: 1px solid var(--archive);
  padding-top: 12px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

/* 合作生态 */
.page-about .about-eco {
  padding-block: clamp(28px, 5vw, 56px);
}
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 42px);
}
@media (min-width: 880px) {
  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
    align-items: start;
  }
}
.page-about .about-eco__figure .figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / 1;
}
.page-about .about-eco__figure .figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about .about-eco__text h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .about-eco__text > p {
  margin: 0;
  max-width: 38em;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-eco__cards {
  margin-top: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
@media (min-width: 620px) {
  .page-about .about-eco__cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-eco__card {
  padding: 14px 14px 16px;
  background: var(--cloud);
  border: var(--line);
  border-radius: var(--radius);
}
.page-about .about-eco__card h3 {
  margin: 11px 0 7px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-eco__card p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

/* 行动区 */
.page-about .about-cta {
  padding-block: clamp(28px, 4vw, 48px) clamp(48px, 7vw, 84px);
}
.page-about .about-cta__box {
  padding: clamp(24px, 4vw, 46px);
  background: var(--ochre);
  border: var(--line);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}
.page-about .about-cta__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper);
}
.page-about .about-cta__box h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--cloud);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 42em;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
}
.page-about .about-cta__actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-cta__actions .btn--ghost {
  background: var(--cloud);
  color: var(--ink);
}
.page-about .about-cta__actions .btn--ghost:hover,
.page-about .about-cta__actions .btn--ghost:focus-visible {
  background: var(--paper);
}
</main>
<<<END>>>